Last updated: June 2, 2025
In Linneus, United States, being aware of the UV Index is crucial for safeguarding your skin and overall health. With peak UV levels reaching 10 around midday, understanding these fluctuations can help prevent sunburn and long-term skin damage. In this Dfb climate zone, characterized by warm summers, residents and visitors are especially vulnerable to intense UV radiation during midday hours. By monitoring the UV Index, you can enjoy the outdoors while taking the necessary precautions to protect yourself from harmful sun exposure.
The UV Index throughout the day exhibits a notable progression, peaking at 10 during the 12:00 PM to 1:00 PM hours, indicating a strong risk of harm from unprotected sun exposure. Starting at a mild 2 at 7:00 AM, the index climbs steadily, surpassing 5 by 9:00 AM and escalating dramatically to its maximum at 11:00 AM with a reading of 9. As the afternoon rolls in, the intensity wanes slightly, dropping to 8 by 2:00 PM, before gradually falling to 5 at 4:00 PM. By evening, the index lowers to a gentle 1 by 6:00 PM, suggesting a return to safer conditions as the sun sets. Staying shaded and using sunscreen is especially crucial during the midday hours for optimal sun safety.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As the seasons change, so too does the UV Index, highlighting the need for awareness regarding sun exposure. January and December feature a low UV Index of 2, allowing for longer burn times of 45 minutes. In the spring, the UV Index begins to escalate, with April reaching a high of 7 (high exposure category) and a 25-minute burn time. The summer months, particularly May and June, present the greatest risk with a peak UV Index of 10 and a burn time of just 15 minutes. As we transition into late summer and fall, the UV Index decreases slightly, but September still holds a significant 7, indicating high risk. To ensure safety, residents and visitors should prioritize sun protection, especially from May through September, when UV radiation is at its highest. Appropriate measures include wearing sunscreen, protective clothing, and seeking shade during peak sun hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linneus | 2 | 3 | 5 | 7 | 9 | 10 | 8 | 8 | 7 | 5 | 3 | 2 |
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |